/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#ifndef __GL_UTILS_H__
#define __GL_UTILS_H__

#include <stdio.h>
#include <stdlib.h>

#ifdef GL_API
    #undef GL_API
#endif
#define GL_API

#ifdef GL_APIENTRY
    #undef GL_APIENTRY
#endif

#ifdef GL_APIENTRYP
    #undef GL_APIENTRYP
#endif
#define GL_APIENTRYP

#ifndef ANDROID
#define GL_APIENTRY
#endif

#include <GLES/gl.h>
#include <GLES/glext.h>
#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>

#ifdef __cplusplus
extern "C" {
#endif

size_t glSizeof(GLenum type);
size_t glUtilsParamSize(GLenum param);
void glUtilsPackPointerData(unsigned char *dst, unsigned char *str, int size,
        GLenum type, unsigned int stride, unsigned int datalen);
void glUtilsWritePackPointerData(void *stream, unsigned char *src, int size,
        GLenum type, unsigned int stride, unsigned int datalen);
int glUtilsPixelBitSize(GLenum format, GLenum type);
void glUtilsPackStrings(char *ptr, char **strings, GLint *length,
        GLsizei count);
int glUtilsCalcShaderSourceLen(char **strings, GLint *length, GLsizei count);
#ifdef __cplusplus
}
;
#endif

namespace GLUtils {

template<class T> void minmax(T *indices, int count, int *min, int *max) {
    *min = -1;
    *max = -1;
    T *ptr = indices;
    for (int i = 0; i < count; i++) {
        if (*min == -1 || *ptr < *min)
            *min = *ptr;
        if (*max == -1 || *ptr > *max)
            *max = *ptr;
        ptr++;
    }
}

template<class T> void shiftIndices(T *indices, int count, int offset) {
    T *ptr = indices;
    for (int i = 0; i < count; i++) {
        *ptr += offset;
        ptr++;
    }
}

template<class T> void shiftIndices(T *src, T *dst, int count, int offset) {
    for (int i = 0; i < count; i++) {
        *dst = *src + offset;
        dst++;
        src++;
    }
}
}
;
// namespace GLUtils
#endif
